title: Modification of carbon nanotube transparent conducting films for electrodes in organic light-emitting diodes.
abstract: Single-walled carbon nanotube (SWCNT) transparent conducting films (TCFs) were fabricated for the electrodes of organic light-emitting diodes (OLEDs); three types of film were studied. The as-prepared SWCNT TCFs displayed a relatively low sheet resistance of 82.6 Ω/sq at 80.7 T% with a relatively large surface roughness of 30 nm. The TCFs were top-coated with poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) to obtain PEDOT:PSS-coated TCFs. The PEDOT:PSS cover improved the conductivity and decreased the surface roughness to 12 nm at the cost of film transmittance. The SWCNT TCFs mixed with PEDOT:PSS (PM-TCFs) exhibited a high conductivity (70.6 Ω/sq at 81 T%) and a low surface roughness (3 nm) and were thus selected as the best TCFs for OLEDs. Blue flexible OLEDs with 4,4'-bis(2,2'-diphenylvinyl)-1,1'-biphenyl (Dpvbi) as the emitting layer were fabricated on TCFs with the same structures to evaluate the performances of the different types of SWCNT films for use in OLEDs. Of these three types of OLEDs, the PM-TCF devices exhibited the optimal performance with a maximum luminance of 2587 cd m(-2) and a current efficiency of 5.44 cd A(-1). This result was explored using field-emission scanning electron microscopy and atomic force microscopy to further study the mechanisms that are involved in applying SWCNT TCFs to OLEDs.
authors.affiliation: State Key Laboratory of Hollow Fiber Membrane Materials and Membrane Processing, School of Materials Science and Engineering, Tianjin Polytechnic University, Tianjin 300387, People's Republic of China.
authors.forename: Jing
authors.initials: J
authors.lastname: Gao
authors.forename: Xue
authors.initials: X
authors.lastname: Mu
authors.forename: Xiao-Yun
authors.initials: XY
authors.lastname: Li
authors.forename: Wen-Yi
authors.initials: WY
authors.lastname: Wang
authors.forename: Yan
authors.initials: Y
authors.lastname: Meng
authors.forename: Xiao-Bing
authors.initials: XB
authors.lastname: Xu
authors.forename: Li-Ting
authors.initials: LT
authors.lastname: Chen
authors.forename: Li-Jun
authors.initials: LJ
authors.lastname: Cui
authors.forename: Xiaoming
authors.initials: X
authors.lastname: Wu
authors.forename: Hong-Zhang
authors.initials: HZ
authors.lastname: Geng